بررسی عددی تأثیر تغییر هم‌زمان هندسه نازل انژکتور و پروفیل بالابری سوزن روی رفتار افشانه سوخت دیزل

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه امام علی (ع)

2 دانشکدهمهندسی مکانیک، دانشگاه بین المللی امام خمینی (ره)، قزوین، ایران

3 دانشکده مهندسی مکانیک، دانشگاه امام علی (ع)، تهران، ایران

چکیده

پدیده کاویتاسیون اثرات مخربی بر عملکرد توربوماشین­ها دارد ولی وقوع این پدیده درون نازل انژکتور تأثیر قابل توجهی بر روی رفتار هیدرودینامیکی افشانه سوخت دارد. هندسه نازل، پروفیل بالابری سوزن و نوع سوخت از عوامل تأثیرگذار در ایجاد این پدیده می­باشند. هدف اصلی و نوآوری تحقیق حاضر بررسی تأثیر تغییر هم‌زمان هندسه نازل انژکتور و پروفیل بالابری سوزن بر روی ایجاد کاویتاسیون و رفتار هیدرودینامیکی افشانه سوخت دیزل می­باشد. بنابراین، در قسمت اول جریان مایع و مشخصات افشانه نازل­های استوانه­ای و مخروطی همگرا دارای پروفیل بالابری سوزن یکسان با استفاده از کد دینامیک سیالات محاسباتی ای وی ال فایر به‌صورت عددی بررسی شده است. در مرحله دوم، نازل مخروطی همگرا با پروفیل­های بالابری سوزن متفاوت شبیه‌سازی شده است. نتایج عددی حاصل در قسمت دوم این مطالعه نشان می­دهند که نازل­های مخروطی همگرا با پروفیل­های متفاوت بالابری سوزن، دارای طول نفوذ افشانه بیشتر و قطر متوسط ذرات کوچکتری نسبت به نازل­های شبیه‌سازی شده در قسمت اول این مطالعه می­باشند.

کلیدواژه‌ها


عنوان مقاله [English]

Numerical Investigation on the Influence of the Nozzle Geometry and Needle Lift Profile Simultaneous Change on Spray Behavior of Diesel Fuel in Injector

نویسندگان [English]

  • reza firoozy 2
  • mehdi poursefi 3
1
2 Department of Mechanical Engineering, Imam Khomeini International University, gazvin, Iran
3 Department of Mechanical Engineering, university of Imam Ali, tehran, iran
چکیده [English]

Cavitation phenomenon has destructive effects on the turbomachines performance but the occurrence of this phenomenon inside the injector nozzle has significant effect on the fuel spray hydrodynamic behavior. The nozzle geometry, needle lift profile and fuel type are effective parameters in creation of this phenomenon. The main goal and novelty of the present study is to investigate the effect of simultaneous change of the injector nozzle geometry and the needle lift profile on the creation of cavitation and diesel fuel spray hydrodynamic behavior. Thus in the first part, the liquid flow and spray characteristics of the cylindrical and converged conical nozzles with the same needle lift profile are investigated numerically using AVL-Fire CFD code. In the second step the converged conical nozzles with different needle lift profiles are simulated. Numerical results of the second part of this study show that the converged conical nozzles with different needle lift profiles have a longer spray penetration length and smaller Sauter-mean diameter than nozzles simulated in the first part of this study.

کلیدواژه‌ها [English]

  • Cavitation
  • Nozzle Geometry
  • Needle Lift Profile
  • Computational Fluid Dynamics
  • Fuel Spray
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